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The Australian actress ended up in a photo-booth with the flame-haired royal and her showbiz pals Sienna Miller, Cara Delevingne and Suki Waterhouse - but at the time, Margot was unaware of who he was.

She said: "Everyone now thinks if they come on a night out with me in London they'll bump into Prince Harry.

"But I didn't even know who it was. I'd had a drink or drinks. I thought I was hanging out with Ed Sheeran. I was thinking 'Ed's a really cool guy'. I'm going to take some pictures with him."

Asked if Prince Harry took the mix-up well, the 25-year-old actress told The Sun on Sunday newspaper: "Nope."

Meanwhile, Margot also admitted she relished making her new movie The Legend of Tarzan because, for once, the focus was on her male co-star, Alexander Skarsgard, rather than herself.

She joked: "I drank so much beer. I was revelling in the fact I could eat whatever I wanted and he couldn't. When I first saw Alex's body my jaw was on the floor with everyone else. He worked so hard."